webcore_testing should depend on webcore_prerequisites
webcore_testing should depend on webcore_prerequisites

BUG=513281

Review URL: https://codereview.chromium.org/1260433002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@199554 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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